ESMA T+1 Settlement Consultation: What EU Firms Must Change in Allocations and Confirmations

ByOfficer

Last updated: May 2026

On 26 May 2026, ESMA published a consultation paper on amendments to the Guidelines on standardised procedures and messaging protocols under Article 6(2) of the Central Securities Depositories Regulation (CSDR). The paper targets one of the most operationally exposed areas of the EU’s T+1 settlement transition: how investment firms and their professional clients exchange allocations and confirmations after trade execution. Get the post-trade communication chain wrong under a compressed settlement cycle and the result is unmatched trades, failed settlements, and cash penalties under the settlement discipline regime.

The consultation reference is ESMA74-2119945926-3513. Responses are due by 7 July 2026. ESMA expects to publish final updated guidelines by October 2026, with the revised guidelines applying from 7 December 2026. The T+1 settlement cycle itself takes effect on 11 October 2027, as set by Regulation (EU) 2025/2075.

This is not a distant regulatory change. The allocation and confirmation requirements apply ten months before the T+1 go-live, and the industry readiness data ESMA cites in the paper is not encouraging.

Related reading: our SFTR reporting guide

What the Consultation Covers

The consultation reviews ESMA’s existing Guidelines on allocations and confirmations, originally published in October 2019. These guidelines specify the standardised procedures and messaging protocols that investment firms and their professional clients should use when communicating allocation details and trade confirmations under Article 6(2) of CSDR.

The review is driven by two regulatory developments. First, Regulation (EU) 2025/2075 amended CSDR to mandate a T+1 settlement cycle in the EU from 11 October 2027. Second, ESMA published its Final Report on Amendments to the RTS on Settlement Discipline (ESMA74-2119945926-3430) on 13 October 2025, proposing changes to Articles 2 and 3 of Commission Delegated Regulation (EU) 2018/1229. Those RTS amendments are expected to enter into application on 7 December 2026, pending endorsement by the European Commission.

ESMA is not waiting for the Commission to endorse the amended RTS before consulting on the guidelines. The rationale is practical: firms need time to prepare, and ESMA sees no indication the RTS amendments will not apply as planned. If the Commission changes anything material during endorsement, ESMA will reassess.

Who Is Addressed

The consultation is primarily addressed to investment firms, credit institutions, their professional clients, central securities depositories (CSDs), and CSD participants. In practice, anyone involved in post-trade allocation and confirmation workflows for transactions in transferable securities, money-market instruments, units in collective undertakings, and emission allowances is in scope.

A common misunderstanding: these requirements apply to the relationship between investment firms and professional clients under MiFID II. Persons exempted under Article 2 of MiFID II fall outside scope. Eligible counterparties and entities categorised as non-professional clients for certain services are still treated as professional clients for Article 6(2) CSDR purposes, provided they appear on Section I of Annex II to MiFID II.

The Shift from Optional to Mandatory Electronic Communication

This is the single biggest operational change in the consultation. Under the current framework, the RTS on Settlement Discipline requires investment firms to offer professional clients the option of using electronic, standardised communication for allocations and confirmations. The key word is “offer.” In practice, many firms still rely on emails, phone calls, or proprietary formats.

The amended RTS flips this from optional to mandatory. Written allocations and confirmations must be sent using an electronic standardised communication method “structured so that software applications can easily identify, recognise and extract specific data, including individual statements of fact, and their internal structure.” This is the machine-readable format requirement.

Investment firms must also ensure, through contractual arrangements, that their professional clients confirm transactions using the same electronic, machine-readable format. The use of international open communication procedures and standards for messaging and reference data, as defined in Article 2(1)(34) of CSDR, is no longer a choice. It is compulsory.

The practical consequence: oral allocations and confirmations are eliminated as a regular practice. ESMA’s consultation paper removes all references to non-electronic and non-machine-readable communication methods except in cases of temporary technical disruptions. For firms still running voice-based allocation workflows in fixed income or OTC markets, this is a fundamental operational change, not a documentation exercise.

What Counts as Compliant: Emails, GUIs, and ISO Standards

ESMA does not restrict compliant communication to a single messaging standard, but the bar is specific. The format must be machine-readable. ESMA references XML, XBRL, XBRL-csv, XBRL-xml, and Inline XBRL as examples of machine-readable formats, drawing on the definition in Commission Implementing Regulation (EU) 2025/1339.

Emails

Emails can still be used, but only if the information transmitted is formatted in a machine-readable way. Sending a plain-text email with allocation details does not comply. Attaching an XML file to an email, or embedding structured data that software can parse, does comply. ESMA confirmed this position in its Final Report on the RTS on Settlement Discipline and reiterates it in this consultation.

Teams that currently exchange allocation details as free-text email bodies or PDF attachments will not meet the new standard. I see this pattern regularly across smaller broker-dealer operations and fund administration desks where counterparties have resisted SWIFT adoption. The deadline for changing this is 7 December 2026, not October 2027.

Graphical User Interfaces

GUIs present a more complicated compliance picture. ESMA distinguishes two scenarios. If a person manually enters data into a GUI, ESMA considers this inconsistent with the automation objectives of the amended RTS. Manual data entry into a portal is not compliant as regular practice.

If the GUI is used to transmit data that is already structured in a machine-readable format (for example, uploading an XML file through a web portal), ESMA’s preliminary view is that this may be compliant, provided the GUI enables transmission in a format that software applications “can easily identify, recognise, and extract” the data.

This distinction matters for firms using CSD participant portals or custodian platforms where settlement instructions are entered through web interfaces. The question is whether the underlying data transmission is machine-readable, not whether the user interacts through a browser.

ESMA explicitly asks stakeholders whether GUIs should be considered appropriate for this purpose. Firms with significant GUI-dependent workflows should respond to the consultation.

Domestic and Internal Standards Are Out

The current guidelines allow professional clients to choose between international and internal (or domestic) messaging standards if the investment firm offers both. The consultation proposes to delete this paragraph entirely. Under the revised framework, only international open communication procedures and standards are compliant. Domestic or proprietary formats no longer qualify.

This catches firms operating in markets where local messaging standards have coexisted with ISO standards. The transition path is clear: ISO 15022/20022 or equivalent international standards, with no fallback to domestic alternatives.

T+1 Settlement Allocations and Confirmations: Timing Requirements

The amended RTS on Settlement Discipline sets a hard deadline for professional clients to send written allocations and confirmations: as soon as possible, and no later than 23:00 CET on trade date. This is the T+0 deadline. Under the current T+2 cycle, firms have more buffer. Under T+1, missing the 23:00 CET cutoff on trade date means the settlement instruction chain starts late, and the probability of a fail on the intended settlement date rises sharply.

The consultation paper does not define “prompt communication” beyond referencing this RTS deadline, but the operational implication is that firms need to compress their entire post-trade workflow into the trading day. For cross-border transactions involving different time zones, this is where the real pressure builds. A US-originated trade executed in the afternoon New York time is already past 23:00 CET.

The phased implementation is worth mapping precisely. The allocation and confirmation requirements under the amended RTS apply from 7 December 2026. Other RTS amendments follow on different dates: settlement fails reporting from 1 July 2027, and the T+1 settlement cycle requirements (hold and release, auto-partial settlement, auto-collateralisation) from 11 October 2027.

Fallback Procedures for Technical Disruptions

The consultation does not eliminate all non-electronic communication. It restricts it to one scenario: duly documented temporary technical unavailability or service disruption affecting either party that makes electronic standardised communication impossible.

In such cases, any written communication method is accepted, including mail, faxes, or other non-machine-readable electronic means. ESMA also permits recorded phone calls during disruptions, provided the calls are recorded in accordance with Article 16(7) of MiFID II and Article 76 of Commission Delegated Regulation (EU) 2017/565.

The conditions are tight. The disruption must be temporary, documented, and resolved without undue delay. This is not a permanent carve-out for counterparties who have not upgraded their systems. Firms that rely on “our client cannot do SWIFT” as a standing justification will not have a regulatory basis for non-electronic communication after 7 December 2026.

ESMA reminds firms that both MiFID II (Articles 16(2) and 21 of CDR 2017/565) and DORA (Articles 10 and 11) already require effective business continuity and disaster recovery plans. The fallback procedure for allocations and confirmations should be part of those plans, not an afterthought.

Contractual Documentation: Simpler Than Before

One area where the consultation reduces burden rather than adding it: documentation of the arrangements between investment firms and professional clients. The current guidelines reference “contractual agreements.” The revised Guideline 1 clarifies that these arrangements may be documented in any legally binding form. They do not need a standalone contract.

Firms can add the allocation and confirmation arrangements to the framework agreement governing their client relationship, referenced in Article 25(5) of MiFID II and Article 58 of CDR 2017/565. ESMA explicitly removes the word “contractual” from subsequent guidelines to signal this flexibility.

This is a small but real operational relief. Renegotiating formal contracts with every professional client to reflect the new electronic communication requirements would be a significant project. Being able to amend existing framework agreements or use other binding documentation formats reduces the legal and operational overhead.

Where teams commonly get this wrong: assuming the documentation flexibility means no documentation is needed. The arrangements must still be legally binding. A verbal understanding or informal email exchange does not qualify. The binding form is flexible; the binding requirement is not.

Industry Readiness: The Numbers Are Not Good

ESMA cites the first EU T+1 Industry Committee readiness survey in the consultation paper. The findings are stark. Of the respondents surveyed, 56% indicated they could be late in issuing allocations and confirmations on T+0 by the end of 2026. Only 51% of respondents are on target to adopt electronic exchange of allocations and confirmations, and just 46% expect to meet the end-2026 target for completing allocations and confirmations on T+0.

These numbers cover the period before the 7 December 2026 application date of the RTS amendments. The implication is that a substantial portion of the industry may not be compliant when the new requirements take effect.

For operations teams, the readiness survey is a useful benchmarking tool. The survey was conducted by the EU T+1 Industry Committee, chaired by Giovanni Sabatini, and the key findings are published through ValueExchange. The next T+1 Coordination Committee meeting is scheduled for 1 June 2026.

What Firms Should Do Before 7 December 2026

The consultation deadline is 7 July 2026, but firms should not wait for the final guidelines to begin preparation. ESMA says explicitly that nothing prevents market participants from applying the new practices ahead of the formal application date.

Map Current Communication Methods

Inventory every professional client relationship and document how allocations and confirmations are currently exchanged. Identify which counterparties still use voice, plain-text email, fax, or proprietary formats. These are the remediation targets.

Assess Machine-Readability

For counterparties already using electronic communication, verify whether the format meets the machine-readable standard. An email with a PDF attachment is electronic but not machine-readable for these purposes. An email with an attached XML file structured so that software can extract individual data elements is compliant.

Update Client Agreements

Amend framework agreements or other binding documentation to reflect the mandatory use of electronic standardised communication. Include fallback procedures for documented technical disruptions. This does not require new standalone contracts, but the arrangements must be binding.

Test End-to-End Workflow Timing

Run the full allocation-confirmation-settlement instruction chain on a T+0 basis and measure whether professional clients can deliver written allocations and confirmations before 23:00 CET on trade date. For cross-border flows, model the time-zone impact. Firms that discover bottlenecks in July have five months to fix them. Firms that discover bottlenecks in November do not.

Respond to the Consultation

ESMA poses a series of specific questions in Annex I of the consultation paper. Several are directly relevant to operational implementation, including the treatment of GUIs, fallback procedures during technical disruptions, and possible simplification measures. The response form is available on the ESMA consultation page.

Luxembourg Context

Luxembourg-based investment firms and credit institutions, including those acting as depositaries or fund administrators for UCITS and AIFs, are directly in scope. The CSSF supervises compliance with CSDR obligations for Luxembourg-authorised entities. Luxembourg’s role as a major fund domicile means the volume of allocation and confirmation flows passing through Luxembourg custodians and transfer agents is significant.

For Luxembourg fund structures where the management company places orders through a broker and the custodian settles, the allocation chain involves multiple parties. I have seen allocation flows at Luxembourg fund administrators pass through three or four intermediaries before reaching the CSD participant, each adding latency. The 23:00 CET deadline on trade date applies regardless of how many intermediaries sit in the chain. Under T+2, that latency was absorbed. Under T+1, it becomes the difference between a matched instruction and a settlement fail.

The CSSF has not yet published specific guidance on the T+1 transition beyond its participation in the EU T+1 Coordination Committee framework. Firms should monitor CSSF communications for any Luxembourg-specific implementation expectations.

Frequently Asked Questions

When do the new allocation and confirmation requirements apply?

The amended requirements under the RTS on Settlement Discipline are expected to apply from 7 December 2026. The revised ESMA guidelines will apply from the same date. The T+1 settlement cycle itself applies from 11 October 2027. The allocation and confirmation changes come first.

Do these requirements apply to all clients or only professional clients?

The requirements under Article 6(2) of CSDR apply to the relationship between investment firms and professional clients as defined under MiFID II. Eligible counterparties and entities on Section I of Annex II to MiFID II are treated as professional clients for these purposes. Retail clients and persons exempted under Article 2 of MiFID II are not in scope.

Can firms still use email for allocations and confirmations?

Yes, but only if the information transmitted is in a machine-readable format. A plain-text email does not comply. An email transmitting structured data in XML or equivalent format that software can parse and extract does comply. ESMA recommends that firms engaging in frequent transactions use international open communication standards by default rather than relying on emails.

What happens if our systems go down on trade date?

The revised Guideline 4 permits non-electronic communication methods (mail, fax, recorded phone calls) during duly documented temporary technical disruptions. The disruption must be documented and resolved without undue delay. This is not a permanent exception for counterparties that have not upgraded their systems.

Are oral allocations still permitted?

Not as regular practice. The consultation removes all references to oral communication of allocations and confirmations except during documented technical disruptions. Recorded phone calls are permitted as a fallback during disruptions, subject to MiFID II recording requirements.

What is the deadline to respond to the consultation?

Stakeholders must submit responses by 7 July 2026. Responses should be submitted through the ESMA consultation page using the provided response form in docx format. ESMA expects to publish final updated guidelines by October 2026.

Does the 23:00 CET T+0 deadline apply to all transaction types?

The deadline applies to written allocations and confirmations for transactions in financial instruments covered by Article 5(1) of CSDR: transferable securities, money-market instruments, units in collective undertakings, and emission allowances. Professional clients must send allocations and confirmations as soon as possible and no later than 23:00 CET on trade date.

Can we use internal or domestic messaging standards instead of international ones?

No. The consultation proposes to delete the paragraph allowing professional clients to choose between international and domestic messaging standards. Under the revised framework, international open communication procedures and standards as defined in Article 2(1)(34) of CSDR are mandatory.

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Key Takeaways

  • ESMA’s consultation (ESMA74-2119945926-3513, published 26 May 2026) proposes mandatory electronic, machine-readable communication for allocations and confirmations, replacing the current optional framework.
  • The revised requirements apply from 7 December 2026, ten months before the T+1 settlement cycle go-live on 11 October 2027.
  • Oral allocations and confirmations are eliminated as regular practice. Non-electronic methods are restricted to documented temporary technical disruptions only.
  • Emails and GUIs can comply, but only if the transmitted content is in a machine-readable format that software can parse. Plain-text emails and manual GUI data entry do not meet the standard.
  • Domestic and proprietary messaging standards are no longer permitted. Only international open communication procedures and standards under Article 2(1)(34) of CSDR qualify.
  • The consultation deadline is 7 July 2026. Final guidelines are expected by October 2026.
  • ESMA’s own readiness survey data shows 56% of industry respondents could be late on T+0 allocations and confirmations by end 2026, signalling significant implementation risk.
  • Firms should inventory current communication methods, assess machine-readability, update client agreements, and test end-to-end T+0 timing now, not after the final guidelines are published.

Sources and References

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